Electrolyte for electrolytic capacitor
View Patent ↗An electrolytic capacitor comprising an anode, cathode and an electrolyte. The electrolyte comprises an aqueous solution comprising a compound of formula 1: CH 3 —(OCH 2 CH 2 ) m —OCH 3 Formula 1 wherein m is an integer from 3 to 10. The electrolyte also comprises an ionogen.
1. A method for providing a capacitor comprising the steps of:
providing a tantalum anode;
providing a cathode;
activating said anode and said cathode with an electrolyte comprising:
water;
about 10 to about 70%, by weight, at least one compound of formula 1:
CH 3 —(OCH 2 CH 2 ) m —OCH 3 Formula 1
wherein m is an integer from 3 to 10;
about 0.05 to about 40%, by weight, ionogen; and
an acid.
2. A method according to claim 1 wherein said m is an integer from 3 to 5.
3. A method according to claim 2 wherein said m is 4.
4. A method according to claim 1 wherein said ionogen is at least one material selected from the group consisting of ammonium acetate, ammonium hydrogen maleate, ammonium hydrogen phosphate, orthophosphoric acid, citric acid, maleic acid, malonic acid, adipic acid and succinic acid.
5. A method according to claim 4 wherein said ionogen is at least one element selected from the group consisting of ammonium acetate and acetic acid.
6. A method according to claim 1 wherein said acid is at least one acid selected from a group consisting of orthophosphoric acid, citric acid, maleic acid, malonic acid, malic acid, adipic acid and succinic acid.
7. A method according to claim 6 wherein said acid is orthophosphoric acid.
8. A method according to claim 1 comprising about 0.05 to about 50%, by weight, said compound.
9. A method according to claim 1 comprising about 5 to about 30%, by weight, said ionogen.
10. A method according to claim 1 wherein said cathode is a conductive metal provided with a semiconductive or metal-like conductive coating.
11. A method according to claim 10 wherein said cathode is at least one element chosen from a group consisting of carbon or an oxide, nitride, or carbide of a metal.
12. A method according to claim 11 wherein said cathode comprises a metal selected from a group consisting of tantalum, titanium, nickel, iridium, platinum, palladium, gold, silver, cobalt, molybdenum, ruthenium, manganese, tungsten, iron, zirconium, hafnium, rhodium, vanadium, osmium and niobium.
13. A method according to claim 10 wherein said cathode comprises a porous ruthenium oxide film provided on a titanium substrate.
14. A method according to claim 1 wherein said aqueous solution has a pH of about 1 to about 7.
15. A method according to claim 14 wherein said aqueous solution has a pH of about 4.
16. A method for providing a capacitor comprising the steps of:
providing a tantalum anode;
anodizing said tantalum anode in an anodizing electrolyte;
providing a cathode;
activating said anode and said cathode with a working electrolyte comprising:
water;
about 10 to about 70%, by weight, at least one compound of formula 1:
CH 3 —(OCH 2 CH 2 ) m —OCH 3 Formula 1
wherein m is an integer from 3 to 10;
about 0.05 to about 40%, by weight, ionogen; and
an acid.
17. The method according to claim 16 wherein said m is an integer from 3 to 5.
18. The method according to claim 17 wherein said m is 4.
19. The method according to claim 16 wherein said ionogen is at least one material selected from the group consisting of ammonium acetate, ammonium hydrogen maleate, ammonium hydrogen phosphate, orthophosphoric acid, citric acid, maleic acid, malonic acid, adipic acid and succinic acid.
20. A method according to claim 19 wherein said ionogen is at least one element selected from the group consisting of ammonium acetate and acetic acid.
21. The method according to claim 16 wherein said acid is at least one acid selected from a group consisting of orthophosphoric acid, citric acid, maleic acid, malonic acid, malic acid, adipic acid and succinic acid.
22. The method according to claim 21 wherein said acid is orthophosphoric acid.
23. The method according to claim 16 comprising about 0.05 to about 50%, by weight, said compound.
24. The method according to claim 16 comprising about 5 to about 30%, by weight, said ionogen.
25. The method according to claim 16 wherein said cathode is a conductive metal provided with a semiconductive or metal-like conductive coating.
26. The method according to claim 25 wherein said cathode is at least one element chosen from a group consisting of carbon or an oxide, nitride, or carbide of a metal.
27. The method according to claim 26 wherein said cathode comprises a metal selected from a group consisting of tantalum, titanium, nickel, iridium, platinum, palladium, gold, silver, cobalt, molybdenum, ruthenium, manganese, tungsten, iron, zirconium, hafnium, rhodium, vanadium, osmium and niobium.
28. The method according to claim 25 wherein said cathode comprises a porous ruthenium oxide film provided on a titanium substrate.
29. The method according to claim 16 wherein said aqueous solution has a pH of about 1 to about 7.
30. The method according to claim 29 wherein said aqueous solution has a pH of about 4.